("-1 day")), "<hr ";
echo "明天:",date("Y-m-d",strtotime("+1 day")), "<hr ";
echo "一周后:",date("Y-m-d",strtotime...",strtotime("last Monday"))."...<hr ";
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."...<hr ";
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."...('Y-m-d',strtotime("$st - 7 days"));
//上周结束日期
$last_en = date('Y-m-d',strtotime("$st - 1 days"));